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</script><span style="font-weight: bold; font-size: 10pt;"><font size="2" style="font-size:10pt;"><b><a href="http://www.opcfoundation.org" style="color: #0000ff; font-size: 10pt; text-decoration: underline;"><img src="opcfoundation.jpg" alt="opcfoundation.jpg" style="border: none;" width="189" height="61" align="left" border="0" /></a>The Interoperability Standard<br />
for Industrial Automation</b></font></span><br />
&#160;<br />
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<td style="vertical-align: top; text-align: right; font-size: 8pt;"><a href="welcome.htm" style="color: #0000ff; text-decoration: underline;">Home</a> | <a href="getting_started.htm">Getting Started</a></td>
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<p style=" border-bottom:Solid 1px #000000; font-weight:bold; text-align:center; border-width:4px;"><span style="font-weight: bold; text-align: center;"><b><span style="font-weight: bold;"><b>Unified Architecture Technology Sample Applications</b></span></b></span></p>
<h1>Troubleshooting</h1>
<p>Unlike OPC Classic, which relied upon the Microsoft COM/DCOM framework, OPC UA is a much simpler solution and requires fewer troubleshooting steps. See also:</p>
<ul type="disc">
<li>
<p><a href="#Tracing">Tracing</a> can be enabled to assist in troubleshooting.</p>
</li>
<li>
<p><a href="firewall_settings.htm">Firewall configuration</a> and TCP port reconfiguration</p>
</li>
</ul>
<p>Common problems are shown below:</p>
<table style="border: Solid 1px #000000; margin-left: 4px; margin-right: 4px; margin-top: 4px; margin-bottom: 4px;" cellspacing="0" width="100%">
<col style="width: 25.617%;" />
<col style="width: 35.133%;" />
<col style="width: 39.25%;" />
<tr>
<td style="border: Solid 1px #000000;">
<p style="text-align: center;"><span style="font-weight: bold;"><b>Error</b></span></p>
</td>
<td style="border-top: Solid 1px #000000; border-right: Solid 1px #000000; border-bottom: Solid 1px #000000;">
<p style="text-align: center;"><span style="font-weight: bold;"><b>Description</b></span></p>
</td>
<td style="border-top: Solid 1px #000000; border-right: Solid 1px #000000; border-bottom: Solid 1px #000000;">
<p style="text-align: center;"><span style="font-weight: bold;"><b>Resolution</b></span></p>
</td>
</tr>
<tr>
<td style="border-left: solid 1px #000000; border-right: Solid 1px #000000; border-bottom: Solid 1px #000000; vertical-align: top;">
<p>Bad_SecureChannelClosed when connecting a client to the server.</p>
</td>
<td style="border-right: Solid 1px #000000; border-bottom: Solid 1px #000000; vertical-align: top;">
<p>UA Server has rejected the certificate and closed the channel.</p>
</td>
<td style="border-right: Solid 1px #000000; border-bottom: Solid 1px #000000; vertical-align: top;">
<p>Launch the Configuration Tool and verify the UA Server and UA Client both trust each other's certificate. See:</p>
<ul type="disc">
<li>
<p><a href="uaconfig_manage_security.htm#Select_Certificate_to_Trust">Select Certificate to Trust</a></p>
</li>
<li>
<p><a href="uaconfig_manage_security.htm#Trust_Another_Application">Trust Another Application</a></p>
</li>
</ul>
</td>
</tr>
<tr>
<td style="border-left: solid 1px #000000; border-right: Solid 1px #000000; border-bottom: Solid 1px #000000; vertical-align: top;">
<p>Exception (AddressAlreadyInUseException)</p>
</td>
<td style="border-right: Solid 1px #000000; border-bottom: Solid 1px #000000; vertical-align: top;">
<p>When launching the Generic UA Server application you see:</p>
<p class="Code">HTTP could not register URL http://+:51211/UA/Sampleserver/. Another application has already registered this URL with HTTP.SYS.</p>
</td>
<td style="border-right: Solid 1px #000000; border-bottom: Solid 1px #000000; vertical-align: top;">
<p>This application can run interactively and as a Windows Service. In this case, the application has been launched interactively, but the Windows Service is already running. You can either:</p>
<ul type="disc">
<li>
<p>Close the server you just opened.</p>
</li>
<li>
<p>Shutdown the service which is identified as: "<span style="font-weight: bold;"><b>UA COM Server Wrapper</b></span>"</p>
</li>
</ul>
</td>
</tr>
</table>
<h2><a name="Tracing" id="Tracing"></a>Tracing</h2>
<p>Each application has a configuration file (*.Config.Xml) containing parameters for tuning the trace output from the UA .NET API. All logs are output to:</p>
<p>&lt;application installation directory&gt;\Logs\</p>
<p style=" border-top:Solid 1px #000000; font-size:6pt; text-align:right; border-width:4px;"><span style="font-size: 6pt; text-align: right;"><font size="1" style="font-size:6pt;">Copyright OPC Foundation 1995-2013</font></span></p>
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